Perhaps you missed the fact that the competitors in the video I posted were also minors. And blunt force trauma sufficient to result in a knockout is absolute positively more dangerous than a blood choke.
It was a foolish thing to do, since the technique can be quite adequately demonstrated without rendering anyone unconscious. But it was not evil.
And while your curriculum apparently does not include these techniques, there are certainly those which do. That means they need to be demonstrated. Not in the way this person chose to do so, but they do need to be demonstrated. And practiced.